Remove guava dependency

[nadirvardar]

Please remove guava 19 dependency. hadoop uses guava 16.0.1 and your library woth spark 1.6 does not work. When I exclude in build.gradle;

compile("com.blacklocus:metrics-cloudwatch:0.4.0") {
    exclude group: 'com.google.guava'
}

I see

16/05/25 15:55:52 ERROR CloudWatchReporter: Exception reporting metrics to CloudWatch. The data in this CloudWatch API request may have been discarded, did not make it to CloudWatch.
java.util.concurrent.ExecutionException: com.amazonaws.AmazonClientException: Unable to load AWS credentials from any provider in the chain
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
etc.

Thank you.